Antonio I Boncompagni (1658–1731) VI Duke of Sora and Arce

Antonio I Boncompagni (1658–1731) VI Duke of Sora and Arce. Knight of the Order of the Golden Fleece. Married his niece Maria Eleonora I Boncompagni (1686–1745) Princess of Piombino.

Gaetano I Boncompagni Ludovisi (1706 –1777) Prince of Piombino

Gaetano I Boncompagni Ludovisi (1706 –1777) Prince of Piombino, VII Duke of Sora and Arce. Knight of the Order of the Golden Fleece. Knight of the Order of Saint Januarius. Married Laura Chigi Albani della Rovere (1707-1792) daughter of Augusto Chigi Albani della Rovere, Prince Farnese.